Move transactions to domain layer

simplenotes-persistance/src/main/kotlin/be/simplenotes/persistance/transactions/KtormTransactionService.kt

@@ -0,0 +1,9 @@
+package be.simplenotes.persistance.transactions
+
+import me.liuwj.ktorm.database.Database
+import javax.inject.Singleton
+
+@Singleton
+internal class KtormTransactionService(private val database: Database) : TransactionService {
+    override fun <T> use(block: () -> T) = database.useTransaction { block() }
+}

simplenotes-persistance/src/main/kotlin/be/simplenotes/persistance/transactions/TransactionService.kt

@@ -0,0 +1,5 @@
+package be.simplenotes.persistance.transactions
+
+interface TransactionService {
+    fun <T> use(block: () -> T): T
+}